Skyyharbour Seaplane Base (11C) is a public-use seaplane base serving Kalamazoo, Michigan, at 853 feet above sea level, with CTAF 118.3. Its lanes: 05W/23W (6,440 × 200 ft, water); 18W/36W (7,920 × 200 ft, water).
This diagram plots every lane from the FAA’s surveyed threshold coordinates, so they sit at true heading and true length — a gift for the pilots, students, instructors and families of 11C.